Why not?
My family’s really close and I’ve known my cousins forever, which honestly gives me squicky feelings about cousin marriage- I mean, seriously.
We played with each other when we were little and still play board games and stuff. I really don’t talk to them so much, especially as they’ve gotten older, but everyone’s nice and friendly, everyone says hi when they meet each other, etc.
A lot has to do with age- my 15 year old cousin (in a super-shtark yeshiva) is more likely to talk to me than my 18 year old cousin.
Look, whatever makes you and everyone else comfortable.